scispace - formally typeset
Search or ask a question
Author

E. Bauge

Bio: E. Bauge is an academic researcher from French Alternative Energies and Atomic Energy Commission. The author has contributed to research in topics: Neutron & Fission. The author has an hindex of 3, co-authored 4 publications receiving 127 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the fission probability distributions of 232, 233, 234 Pa and 231 Th have been measured up to an excitation energy of 15 MeV, using the transfer reactions 232 Th( 3 He, t) 232 Pa, 232 Th ( 3 He,d) 233 Pa, and 232 Th 3 He 4 He) 231 Th.

67 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used the surrogate reaction method to obtain the neutron-induced fission cross-sections for the first time up to the onset of second-chance fission.

59 citations

Proceedings ArticleDOI
24 Apr 2008
TL;DR: In this paper, a recent measurement to determine neutron-induced fission cross sections for the actinides 242,243Cm and 241Am is questioned by their results, since there are differences of more than 60% in the 0.7 to 7 MeV neutron energy range, and the experimental set-up has also enabled them to measure for the first time the fission fragment "pseudo-mass" distributions of 243,244,245cm and 242Am compound nuclei in the excitation energy range from a few MeV to about 25 MeV.
Abstract: The surrogate reaction method is a powerful tool to infer neutron‐induced data of short‐lived nuclei. After a short overview of the experimental techniques employed in the present surrogate experiments, we will concentrate on a recent measurement to determine neutron‐induced fission cross sections for the actinides 242,243Cm and 241Am. The latest direct neutron‐induced measurement for the 243Cm fission cross section is questioned by our results, since there are differences of more than 60% in the 0.7 to 7 MeV neutron energy range. Our experimental set‐up has also enabled us to measure for the first time the fission fragment “pseudo‐mass” distributions of 243,244,245Cm and 242Am compound nuclei in the excitation energy range from a few MeV to about 25 MeV.

8 citations

Journal ArticleDOI
01 Feb 2012
TL;DR: In this article, the authors used the surrogate reaction method to extract neutron-induced fission cross sections of short-lived actinides in the rare-earth region of the United States.
Abstract: The measurement of neutron-induced cross sections of short-lived nuclei is extremely difficult due to the radioactivity of the samples. The surrogate reaction method is an indirect way of determining cross sections for nuclear reactions that proceed through a compound nucleus. This method presents the advantage that the target material can be stable or less radioactive than the material required for a neutron-induced measurement. We have successfully used the surrogate reaction method to extract neutron-induced fission cross sections of various short-lived actinides. In this work, we investigate whether this technique can be used to determine neutron-induced capture cross sections in the rare-earth region.

2 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: A review of the current status of the surrogate approach can be found in this paper, where experimental techniques employed and theoretical descriptions of the reaction mechanisms involved are presented and representative cross section measurements are discussed.
Abstract: Nuclear reaction cross sections are important for a variety of applications in the areas of astrophysics, nuclear energy, and national security. When these cross sections cannot be measured directly or predicted reliably, it becomes necessary to develop indirect methods for determining the relevant reaction rates. The surrogate nuclear reactions approach is such an indirect method. First used in the 1970s for estimating ðn; fÞ cross sections, the method has recently been recognized as a potentially powerful tool for a wide range of applications that involve compound-nuclear reactions. The method is expected to become an important focus of inverse-kinematics experiments at rareisotope facilities. The present paper reviews the current status of the surrogate approach. Experimental techniques employed and theoretical descriptions of the reaction mechanisms involved are presented and representative cross section measurements are discussed.

191 citations

Journal ArticleDOI
TL;DR: This work first of all reviews the recent developments in experimental fission techniques, in particular the resurgence of transfer-induced fission reactions with light and heavy ions, the emerging use of inverse-kinematic approaches, both at Coulomb and relativistic energies, and of fission studies with radioactive beams.
Abstract: In the last two decades, through technological, experimental and theoretical advances, the situation in experimental fission studies has changed dramatically. With the use of advanced production and detection techniques both much more detailed and precise information can now be obtained for the traditional regions of fission research and, crucially, new regions of nuclei have become routinely accessible for fission studies. This work first of all reviews the recent developments in experimental fission techniques, in particular the resurgence of transfer-induced fission reactions with light and heavy ions, the emerging use of inverse-kinematic approaches, both at Coulomb and relativistic energies, and of fission studies with radioactive beams. The emphasis on the fission-fragment mass and charge distributions will be made in this work, though some of the other fission observables, such as prompt neutron and γ-ray emission will also be reviewed. A particular attention will be given to the low-energy fission in the so far scarcely explored nuclei in the very neutron-deficient lead region. They recently became the focus for several complementary experimental studies, such as β-delayed fission with radioactive beams at ISOLDE(CERN), Coulex-induced fission of relativistic secondary beams at FRS(GSI), and several prompt fusion-fission studies. The synergy of these approaches allows a unique insight in the new region of asymmetric fission around 180Hg, recently discovered at ISOLDE. Recent extensive theoretical efforts in this region will also be outlined. The unprecedented high-quality data for fission fragments, completely identified in Z and A, by means of reactions in inverse kinematics at FRS(GSI) and VAMOS(GANIL) will be also reviewed. These experiments explored an extended range of mercury-to-californium elements, spanning from the neutron-deficient to neutron-rich nuclides, and covering both asymmetric, symmetric and transitional fission regions. Some aspects of heavy-ion induced fusion-fission and quasifission reactions will be also discussed, which reveal their dynamical features, such as the fission time scale. The crucial role of the multi-chance fission, probed by means of multinucleon-transfer induced fission reactions, will be highlighted. The review will conclude with the discussion of the new experimental fission facilities which are presently being brought into operation, along with promising 'next-generation' fission approaches, which might become available within the next decade.

141 citations

Journal ArticleDOI
TL;DR: In this paper, the validity of the surrogate ratio method for determining (n, f) cross sections for actinide nuclei is examined, and a nuclear reaction model is developed to investigate whether the assumptions underlying the ratio approach are valid.
Abstract: The validity of the Surrogate Ratio method for determining (n,f) cross sections for actinide nuclei is examined. This method relates the ratio of two compound-nucleus reaction cross sections to a ratio of coincidence events from two measurements in which the same compound nuclei are formed via a direct reaction. With certain assumptions, the method allows one of the cross sections to be inferred if the other is known. We develop a nuclear reaction-model simulation to investigate whether the assumptions underlying the Ratio approach are valid and employ these simulations to assess whether the cross sections obtained indirectly by applying a Ratio analysis agree with the expected results. In particular, we simulate Surrogate experiments that allow us to determine fission cross sections for selected actinide nuclei. The nuclei studied, {sup 233}U and {sup 235}U, are very similar to those considered in recent Surrogate experiments. We find that in favorable cases the Ratio method provides useful estimates of the desired cross sections, and we discuss some of the limitations of the approach.

75 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used the surrogate reaction method to obtain the neutron-induced fission cross-sections for the first time up to the onset of second-chance fission.

59 citations

Journal ArticleDOI
TL;DR: In this article, a nuclear reaction model is employed to simulate physical quantities that are typically measured in surrogate experiments and used to assess the validity of the Weisskopf-Ewing and ratio approximations, which are typically employed in the analysis of surrogate reactions.
Abstract: Motivated by the renewed interest in the surrogate nuclear reactions approach, an indirect method for determining compound-nuclear reaction cross sections, the prospects for determining ($n,\ensuremath{\gamma}$) cross sections for deformed rare-earth and actinide nuclei are investigated. A nuclear reaction model is employed to simulate physical quantities that are typically measured in surrogate experiments and used to assess the validity of the Weisskopf-Ewing and ratio approximations, which are typically employed in the analysis of surrogate reactions. The expected accuracy of ($n,\ensuremath{\gamma}$) cross sections extracted from typical surrogate measurements is discussed and limitations of the approximate methods are illustrated. Suggestions for moving beyond presently employed approximations are made.

54 citations